Document gae8KbQ2b7wwMb5n02mwkaq4L

E. I. DU PONT DE NEMOURS & COMPANY mats PIGMENTS DEPARTMENT 256 VANDERPOOL STREET NEWARK. NEW JERSEY Serial No. Copy No. / iv NEWARK PLANT PIGMENT COLOR RESEARCH REPORT INITIAL $ Tim REPORT IMPSCrSKE'fT OF 2 INC T2LL0W STRUCTURAL PRIMERS Period Covered: FILE. DATE: 143.5 & 173.04 10/3/46 NJflATS N39956 DUP050150089 So* KE-4&-73 Copy Bo. / #1 - Kunarlaal File 2 - Reeeoreb Offlso (143.5) 3 - Library Fllo (143.#) 4 - Foist L*boratory(143.5) 5- * * (173.04) 6 - Hr. R. H. Pohl 7 - Mr. F. B. Bolton 8 Bp* If. Fo Smb mms i 9 - Mr. J.O. MorrUon/R.R.Danelew/Res.Fllo 10 - Dr. J. B. Calloway 11 rtn z 12 - ICJC BBU1BK PLANT PIOMKHT COLOR RESEARCH REPORT Initial ft Final Report Tltlot Xnprovo&eat of Zlae Tallow Struotnral PrInara SUBMITTED BTt I.*J. O'BolU APPROVED BTt E. C. Botti &.C- ftesiK- DATE SUBKXTTBDt 10/3/46 DATE ISSUED. 10/24/46 N399S6.01 DUP050150090 OBJECT! To improve the following properties of the eurrent P-244-I* structural primer* Drying tins Brushing Leveling (Hew) Spreading rate Coat Hotting of mated steel Disti&otlve primer color f-539-D/fcwrits fellow/Talo-40/4Q/30, fa GB-2466/Rav L.0,-50/50. This investigation was prompted by tha conviction of the writer that research along tha lines of improved darability alone h&a rseohed tha point of diminishing returns and that a sow approach Bight load to a sore rapid advance in sine yellow primer technology. Tha plan of research was to formulate a primer possessing tha optimum in the qualities listed above, and then to alter those properties somewhat if durability- requirements made it necessary. SUMMARY! The primer (1224-15-35) resulting fro auch a study is T-539-D/ Wiiting/AlTOixium-38/57/5 in 8.8,1, 8-239 aUqrd*/ftold Rafi&sd L.0,-50/50 at 35$ FT* Comparison with red lead in oil (conservation formula) and orthodox F-244-I ie aa follows! iis a -h -m Bed Lead P.gAA-T Drying time Consistency, 7 day Leveling Spreading Bata at ,002* dry film, (sq.ft./gal.) Oost/Qftlf Coat/1000 sq.ft, dry film, .002" Hatting of rustod stool Distinctive Color Durability Can Stability si.* 82 el, * equal Si.* 82 si.* equal 670 600 11.56 62.30 14.67 si. si. light green red orange To be detd. (Series 7029) std. 69 std. std. 525 61.45 62.46 none mustard g^fiawai 1. Primers oontainiag 8.8. Industrial Chemicals 8-239 experimental rosin or DuPont RC-141 giro the greatest wetting of rusted steel. 2. 8,8,1. 8-239 sad DuPont BO-141 prisons require the least thinner for reduction to 75 XBj, hencejlel^.thoJiigheai theoretical spreading rates. * It should be home in mind that this is aa experimental alkyd and is not in production at present. DUP050150091 ' -3- oil* 3, Acid refined linseed oil vat* rusted steel batter than raw linseed 4* Aoid refined linseed oil in tha primer Imperte batter brushing than raw lliwsed on. 5* Oallta U0 or York t&itlng replacing talo require tha least thinner far reduction to 75 KB. ^ 6. In bo b* of tha prinera is reactivity or water-sensitivity excessive. 7. Formulation 1124<45-3$, encompassing the changes indicated bar the foregoing conclusion* is outstanding in brushing, oast, sad watting of rusted steal, the only volatile is the primer la that eeutalaed in the alkyd solution, uo extra thinner bsing required. Drying tine is slightly batter than red lead, fta* it possesses a pleasing Ugfct green oolor. la general, this primer eanpares wary well with red lead in applieatlea properties. DISCUSSION* ^ Research in struetural primers has Imtsfim concentrated itself in improvements in durability. Changes in formulation dletsted by improved durability often altered the application properties (brushing and leveling eto.) so such that a eoaproniae is durability was necessary la order to obtain a praetloal paint product. The optimum primer so far, and tha one vhloh we are currently prosating In the structural field, la P-224-BR or F-244-T. P-224-SR is 1-337/ brown Iron oxide/tale-40/30/30 in alkyd/raw L.0.-50/5O, while P-244-* is the Sana as P-224-8R, but with ferrite yellow replacing the brown iron oxide. Our aost serious competition In the structural primer field is red lead. Bad lead struotural prhears are of four types* a) Red lead in raw linsesd oil. b) Red lead conservation formula. This contains about 50$ bodied linseed oil in the vehicle end carries about 7$ volatile natter by weight. e) Bed lead in oil fortified with synthetic reels. d) Extended red lead in oil or in the conservation oil vehicle. The orthodox red lead primer is the one usually thought of by the average user. Xt appears, however, that the conservation formula beeaae well established during the war, return* practically the same results, and is here to stay. Especially is this trua when viewed in the light of continued oil shortages. The resin fortified red load primrs are not too well accepted by most users because of the decreased watting and adhesion on rusted surfaces. Xt would appear, toe, that the lead industry is not emphasising such primers for structural work. On the other hand, the short lead supply and the lover cost of competitive sine yellow primers has osnssd increased promotion of ex tended red lead primers by that industry. DUP050150092 In trade contests, the writer ban met surprisingly fan ware who contend that rad load durability la superior to aiao fallow. The subject of durability baa beau an opea question la asst sails. Invariably, the applleatioa properties of sine fallow prlaars era attacked. Poor watting of rusted steal, low spreading rata, slower drying, power brushing, henee a tandenoy to over* thin on the job, ate, are the points of criticism. iron the above evidenoe, tbs lapertauea of iaproving our reoomnandad atruotural primer in application properties cannot be ever-emphasised. It la felt that the candidate, 1124-15-35, has extremely promising oharaotaristios. The aattar Of a distinctive color is felt to bo highly im portant froa a psyohclogiosl and promotional point of view, and color ohipe am attaohod for Inspection. The natter of high solids oontentls also a faotor, which, oouplod with good brushing, should insure against eoeeseive thinning by the painter on the jab. She aasuat of aluainua paste added is only suffioient to give complete hiding at ,0015 dry filn thickness, thus iaeurlng against thin spots in application. This paste is not a separately added component, but eouatitutes m ingredient of the readJNuixed prinar. This aluniaun content produoaa the green color, and was chosen because of the higher probability of good durability. Little is known about the ooaparatlve durability of raw and acid re fined linseed oil, Whiting As an extender has received hardly any attention in previous exposure series at Rewaxk, but work at Seaport using this extender la tinted house points hea shown it to have promising durability, 1124-15-36 is a more conservative pigmentation of 1124-15-35, It is X-539-D/Farrite Xellow/Talo-40/30/30 in U.S.I. S-239/Aeid Refined L.0.-50/50, and requires additional thinner to taring it to 75 K0* Heavy mineral spirits was weed to avoid the too rapid set-up of the film observed in moat of the notwithstanding, it does not brush as well as the 1124-15-35. Formula: I-539-D Whiting G.S.I. S-239 Acid Refined L.O. Pasta* 24$ Pb Hapbthenate 6$ Co. * 6$ m * 397 308 216 50 17.3 2.9 2.2 1258.4 * Added in the reduction of the mill base, & 17.60 39.00 27.80 4.10 1.83 .38 ......29 100,06 3.8.1, 8-2391 70* solids, 7.90/gal. Gallon Weight1 12,6# % Solids in Total Faint< 83,6% by vol. F7* 35$ Consistency; immediate: 75 XU DUP050150093 Thenarimer# investigated da this study ere modifications of P-244-Y .v.js^sa and comprise Series 7029# the aeries somber osier which tbsy will be exposed. Weee detailed information of the modifications studied, reference Is made to the data sheets. The following, however, soamariaes the variables eelanti a) Paints So. X to 9 compare resias substituted for OB-2466. 10 to 13 compare straight linseed oil vehicles. s) 14 to 24 cover various extender types and ratioe. d), 25, 36 contain ZnO partially replacing Y-539-D, e) 27 to 30 comprise the oeatrols. f) 35 to 36 represent the improved prlraara, or the final eeadidetes in good application properties. The teat of the aMllty of a primer to vet rusted steel Is outlined la "The Protection of Structural Steel with Paint", Geo. Biehlaam Paint, Oil ft Chea. Rer. July 11, 1946. This teat Is to allow a small drop of the paint to fall oa a rusted panel, peralt It to dry and observe the width of the dark ring arouad the dried paint spot. Water sensitivity of & few selected primers (paints 1 to 13 and those containing whiting) was measured by adding 11 by volume of soap solution and following tha consistency trend. The extenders and miscellaneous pigments uaed were the followings Tele--Stanley Doggett #162 Magnesium Silicate--Asbestine 3X Cellte 130 fork Whiting ZZZ-11 Zinc Oxide Yellow Iron Oxide--Maploo Lemon Yellow RgFSRBSQgSt Red Iron Oxide--aelehsrft-Goulaton #671 Aluminum Paste--Albron 205 Exposure Programt 3-7029. "The Protection of Structural Steel with Paint" - Geo. Diehlsam Paint, Oil ft Chen. Rev. July 11, 1946. DUP050150094 J 1 !$ sai gap PSS a8.a aa$; p p p saa SM? ggg Sg rf* *8g PS8 83$ pa* c?Sa 8*8 *PP g88 *sa sea PSSB 383$ gSfl 3PP I DUP050150095 X 88 t- o 88 o S 44 PP 888 ;0o *!.* 4.ooP 'S'Sl $$P t^oot? m *: S?P o 3S <r[jr< *i >1 O ^ 88 88 S8# P88 I : 0>O P W BO P . ci *** *3 >o [I <54 o hP t*ga * *3 8 0 P A g :;i I it n DUP050150096 f o r Penas. State Hwy, s s O JR # & OO8 4 * A m J4 V ' : ' p s *a >.' : : * ' .-' ! a. *"N f 5 t?ea 4 * 3 at, 5 "1 j 8 O ? * ?? it DUP050150097 P-224-BR P-244-Y 1124-15-35 DUP050150098